If the path contains Japanese in windows, mecab_load will give an error.

Like this:

```bash
OPEN_JTALK_DICT_DIR='C:\Users\hihok\Downloads\日本語！\open_jtalk_dic_utf_8-1.11' \
python -c 'im port pyopenjtalk; pyopenjtalk.tts("ほげ")'
ERROR: Mecab_load() in mecab.cpp: Cannot open C:\Users\hihok\Downloads\譌･譛ｬ隱橸ｼ―open_jtalk_dic_utf_8-1.11.
```

Windows用に文字エンコーディングを変更すればこのエラーを迂回できます。
https://github.com/r9y9/pyopenjtalk/pull/17